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A filter pattern is a character string that defines a logical expression that is evaluated to determine which files and folders match the pattern. A file filter pattern can contain complex regular expressions and wildcards. See Folder Filters for more information on what a folder filter pattern can contain.
Files and folders that match an exclusion pattern are excluded from the watch set; files and folders that match an inclusion pattern are included the watch set. For example, in the following file filter definition, files with names ending in *.dotx are excluded and files with names ending with *.docx are included: